注意：这个表的大小是由符号常量nr_syscalls定义的。
Note: the size of this table is defined by the symbolic constant NR_syscalls.
通过定义同义词，可以使用更短的符号表示表数量。
By defining a synonym, you can refer to table quantities by using a shorter notation.
函数定义在当前符号表中引入函数名。
A function definition introduces the function name in the current symbol table.
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